Adaptation, multiple disease resistance and acid soils tolerance of bean genotypes.
The objective of this
experiment was to select bean genotypes with high yield
potential, wide adaptation, multiple disease resistance and
tolerance to acid soils. For that reason, during the Fall-Winter
1999-2000 cycle, a uniform yield trial was conducted in four
environments in Veracruz and Chiapas, Mexico. Sixteen
genotypes were evaluated, including the varieties Negro
Jamapa as a regional control. A randomized Complete Block
design with three replications was used. Grain yield was
evaluated by means of individual and combined analysis of
variance and stability parameters. Reaction to diseases was
graded according to a 1-9 scale; the Efficiency Index (IE) was
used to evaluate the tolerance to acid soils. There were
significant differences in grain yield and tolerance to diseases
for localities, genotypes and the locality .genotype
interaction; whereas for the tolerance to acid soils there was
no significant differences between localities and the
interaction. The best genotypes with regard to yield,
adaptation and tolerance to acid soils were Negro 8025,
DOR-454, Icta Ju 95-112, Icta Ju 93-15 and DOR-448; the
first and the last varieties had multiple resistance to diseases.
The lines UCR-55, TLP-22 and DOR-500 also showed high
yields and multiple disease resistance.
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